import React, { Component } from 'react'
import store from '../../redux/store'

export default class Count extends Component {
    // componentDidMount(){
    //   store.subscribe(()=>{
    //     this.setState({})
    //   })
    // }
    increment=()=>{
        const {value} = this.selectNumber
        store.dispatch({type:'increment',data:value*1})
    }
    decrement=()=>{
        const {value} = this.selectNumber
        store.dispatch({type:'decrement',data:value*1})
    }
    incrementIfOdd=()=>{
        const {value} = this.selectNumber
        if(store.getState()%2!==0)
          store.dispatch({type:'increment',data:value*1})
    }
    incrementAsync=()=>{
        setTimeout(()=>{
            const {value} = this.selectNumber
            store.dispatch({type:'increment',data:value*1})
        },500)
    }
  render() {
    return (
      <div>
        <h1>当前求和为：{store.getState()}</h1>
        <select ref={c=>this.selectNumber=c}>
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>&nbsp;
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>&nbsp;
      </div>
    )
  }
}
